Corrections in the printed version
- Page 14, 15: Replace
$\psi$ ->$\hat{\psi}$ ;$\phi$ ->$\hat{\chi}$ for consistency - Page 23: Citation: Augier, Mohanan & Lindborg (2017) -> (2019)
- Page 26, 28, 64: Repeated citation. Riley & de Bruyn Kops (2003a, 2003b) refer to the same article